A

Matching the pairs from Column-I to Column-II:

1. **(i) Atomic excitation** is associated with the absorption of energy, leading to the transition of an electron to a higher energy level. This is represented by [A] Absorption spectrum which is a result of the absorption of light by atoms as they become excited.

2. **(ii) Lyman series** refers to the series of spectral lines corresponding to transitions of electrons in hydrogen atoms from higher energy levels to the first energy level. It is independent of the mass of the electron, hence it matches with [B] Independent of mass of electron.

3. **(iii) Rydberg constant** is a physical constant related to atomic spectra that depends on the electron's transition states in hydrogen but is considered typically independent of the electron's mass due to the nature of spectral lines derived from such transitions. The most fitting option here is [C] Inelastic collision, as atomic interactions can lead to inelastic collisions and subsequent state transitions.

4. **(iv) Speed of electron** varies inversely with the mass for a given energy level within an atom; thus it aligns with [D] Dependent on mass of electron.

Conclusion:
The correct matches are:
(i) - A
(ii) - B
(iii) - C
(iv) - D.
Therefore, the correct answer is A.